Hand pump



Feb. 3. 1925. 1,524,683

G. BERTELSMANN INVENToR. 6km/1 ecrf; www.

A TTORNEYS.

Fei. 3. 1925.

G. BERTELSMA N N HAND PUMP Filed Aug. G. 1923 5 Sheets- Sheet 2 INVENTOR.

GLEN/v ferfzsMA/wx f A TTORNEYS.

"Feb, 3. 1925. 4 1,524,683

G. BERTELSMANN HAND PUMP Filed Aug. 6. 1923 3 SheetslSheet 1 INVENTR- ATTORNEYS.

Fig. 2, the base 18 comprises a central body portion with two opposite extensions, one of which is elongated. Extending through said base from one extension to the other is a channel 25 having a communicating outlet 26 connecting said channel with the interior ot. the cylinder 10. Also communicating with said channel 25 is a chamber 27 formed in the single projection of. said base 18, and said chamber serves as an intake chamber and a spring chamber. The chamber is provided with a threaded opening 28. Aclosure member 29 has a threaded engagement with said threaded end 28 and is also centrally apertured at 30. Con'imunicating` with said central aperture 30 is a plurality of transverse ports or: channels 31 communicating with the atmosphere. In axial align- Y'ment with the channel 30 is a recess 32, and

in said recess is slidably supported a hollow valve stem carrying upon its lower free end a valve 34 which is positioned in the chamber 27. Concentric with said valve is a coiled spring` 35 'for normally maintaining` said valve in closed position. Upon the upward or suction stroke oi the piston in the cylinder 10, the atmospheric pressure en-r gages upon the valve 34 and unseats `the same. simultaneously compressing the spring 35; sinceupon said upward stroke of the piston there is'created a vacuum in the cylinder 10. As shown in Fig. 4, the valve stem extends loosely through the channel 30. Upon the return or compression stroke of the piston, the spring 35 seats the valve 34, and subsequent pressure through the compression in the cylinder seals said valve on its seat.

Figs. 3, 4 and 5 illustrate in detail the discharge mechanism or" the pump. That portion of the channel 25 which extends into the elongated projection hereinbefore mentioned communicates with a channel 36 which is extended at 37. Said extended channel 37 is again extended at 38, and branching from said extension and communicating1 thereouter-end is provided with a threaded surface, and positioned within said channel 38 and having a driven tit in the channel portion 37 is a tubular member 41 which eX- tends through said channel 38 and provides an inner passage and a concentric outer passage. Secured in the threaded portion of the channel 38 is a cap or closure member 42 suitably recessed at 43 and having a chamber 44 communicating therewith, Slidably supported in said recess is a valve stem 45 carrying` on its free end in thel chamber 44 a valve 46, which valve by the tire pressure or vacuum in channel 25 is normally seated upon the endof the tube 41 to seal the same until such time as pressure within the tube 41 unseats said valve and permits the comita/resa press d air to escape 'from the channel 36 to the concentric channel 1n the chamber 38, and thence to either or both of the branching channels 39. Thus, upon thc intake stroke otthe piston, the suction seats the valve 46 and unseats the valve 34; while upon the coi'npressionrstroke of the piston, the valve 46 is unseated andthe valve 34 is seated.

The branched channel 38. see Fig. 5, is en larged at 48 and is threaded at its outer end. A hose attaching stem 49 having the usual channel 5() therethrough has a threaded c0n nection with said base 18. and said channel 50 communicates with the chamber 48, and, therefore, the branching channel 39 also communicates with the hose 21 which is secured to the foot base 18 by means of the barbed attachment 49. rlhe other end of the hose 21 is similarly secured to a barbed supporting portion 51 of the body portion 22 ot said dischargingI nozzle. The discharging nozzle body portion 22 is apertured at 52. and positioned in said aperture is a stein 53 concentric therewith and providing an annular discharge passage therebetween. The body portion 22 is enlarged at 54 and is provided with a spherical surface. The connecting means includes a knurled portion 55 and a spherical engaging portion 56 for engaging the fia-nge portion. or enlarged portion 54 thereby forming a ball jioint. The knurled linger portion 55 is provided with a threaded interior which is adapted to engage the threaded exterior 57 of a tire valve 58, saidvalve including the usual valve portion 59 and stem 60, said valve being normallj1 seated by means of the spring 61. Included between the finger piece 55 and the flange 54 is a washer 62 which bears against the projecting portion ot'the valve stem 57 and maintains a seal between said flange 54 and said valve stem 57 when the discharge noz- Zle is in seated or closed position. The pro jecting stem 53 hereinbet'ore described includes a threaded connection 63, and posi* tioned upon said stem and without said nozzle a finger piece 64 for threading said stem into and out ot said nozzle. Thus, when thestem is normally in lowered position and the linger piece 55 is threaded down upon the valve stem, said stem 53 engages the stem 60 of the valve mechanism in the valve ot the article to be inflated and unseat-s the same. An enlarged portion 65 prevents the escapement of lstem 53. Air pressure thereupon is communicated through the hose 21 and branch channel 39 to the chamber 38, which seats the valve 46 until such time as said valve is unseated by the compressed air discharged by said pump. Thus, the air discharged by the pump merely has to lift the valve 46 after its pressure is equal to the pressure in the article to be inflated, and, therefore, does not have to unseat the valve 59 by depressing the same,

and, therefore, compressing the spring 61 at each stroke of the piston. The above, therefore, secures more efficient operation of the pump.

After the article has been inflated to the desired pressure in order to maintain said pressure, the finger piece 64 is turned outwardly, thereby moving the stem 53 out of engagement from the stem 60, and thereby permitting the valve 59 to be seated through the spring 61 and also the air pressure therein. Thus, there is no loss of pressure from the inflated article when the finger piece is removed from the valve stem.

The branch channel 40 is enlarged at T0, and said chamber' is threaded at its outer end and is closed by a plug 72, which plug 72 slidably supports the stem 73 of a valve 74, which is seated by air pressure upon the compression stroke of the piston or by the pressure of the air in the article to be in- Hated when said pressure exceeds atmospheric pressure and the weight of said valve.V

The valve stem is cut away at 75 to provide a passage therethrough when the valve is unseated. Therefore, until such time as the pressure in the article to be inflated exceeds that of the atmosphere, plus the Weight of the valve 74, said valve will open upon the suction stroke. This branch channel 4() is also provided as a bleeder when it is desired to reduce the pressure of the article to be inflated to a desired pressure.

This branch rchannel also is` adapted to receive suitable pressure indicating means, reference now being had to Figs. l7? and 8. Then the same is used as an integral part of the pump, the beforementioned closure member and the valve 74 is removed from the chamber 7 O and the base 80 of a pressure indicating device 81, including the communicating piston portion 82. Thus, the pressure ind1cat1ng means will positively'register at all times the pressure of the article to be inflated. Y

Figs. 7 and 8 also illustrate a modified form of the invention, wherein the intake -valve mechanism hereinbefore described and clearly illustrated in Fig. 4 is replaced by a substantially similar mechanism, wherein a closure member 129 is substantially similar to the closure member 29 andthe transverse or intake ports 131 are substantially similar to the ports 31, with this exception,v

however, that the exterior of said closure member 129 is suitably threaded to receive a cylinder or tube 13() having its open end closed by means of a protecting screen 132. The ports 131, therefore, communicate with the tube and With the atmosphere through said screen and tube. Thus, all the air which enters the pump, and the article to be inflated through the tube is screened. This not only prolongs the life of the pump and insures more eflicient operation thereof, but also prevents foreign particles from entering the article to be inflated.

In Fig. 9 is illustrated a modified form of the invention, wherein the hose 21 is suitably separated' at any desired point and a T connection 140 inserted therein which T connection is provided with a chamber 141 adapted to receive a valve 142 having the stem 143 slidably supported in a closure member 144 for closing said chamber 141. The pressure indicating means 81 is adapted tobe inserted at this point insubstantially the same manner as hereinbefore described with the replacement of the valve 74 and closure member 72 as illustrated in Figs. 5 and 8.

While the invention has been described in great detail in the beforementioned specifications, it is to be understood that the same is illustrative and not restrictive in character, and that the invention is susceptible of many modifications thereof without departing from the broader features of the invention.

The invention claimed is:

A pump construction including a cylinder, a piston therein, a base connected to said cylinder at one end thereof and having enlargements extending' oppositely from the cylinder, a check valvecontrolled intake in one of said enlargements, and a check valve controlled outlet in the other enlargement, a T-shaped channel in the last-mentioned enlargement having its main branch communicating with the outlet, a hose connection in one lateral branch of said Tfshaped channel, and a valved outlet for the other lat l branch. f

In witness whereof, I have hereunto aflixed my signature.

GLENN BERTELSMANN. 

